When the jabs first came out I remember they said they had to be held in cold temps. How many places kept them that way until injection? And how long did they need to be given before they were unusable? So the jab ingredients were unstable at room temperature or being too warm over time.

I would suspect some batches were changed due to being too warm. So were they the ones that would more likely cause issues or more likely to be less effective and less toxic?

Just wondering